A tree-trimming company based in Houston reached a $2 million settlement agreement with the Department of Homeland Security that will allow it to avoid criminal prosecution for hiring illegal immigrants, officials announced Friday. The agreement capped an investigation into ABC Professional Tree Services Inc. that dates to early 2008, when Homeland Security Investigations agents in Alabama were tipped off that the company was hiring illegal immigrants. The company, which trims trees and vegetation for electric utilities in more than a dozen states, made about $2 million between 2005 and 2011 from the work of illegal immigrants, according to the U.S....